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Onless the needle was removed, then there is no way to calibrate it at all. You can put the needle whereever you want, once you put power to it, it's going to go to where ever it wants to go.
Grounding out the sender wire, and removing the needle and putting it E will make it inacurate. The needle should swing to the 9 O'clock position (Or close to) when you ground it out.
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